Reverse osmosis is a membrane separation technology with the help of selective permeability (semi-permeability) membrane work force energy with pressure as the driving force. When the pressure added in the system is greater than the osmotic pressure of the incoming solution, water molecules continuously pass through the membrane and flow into the central tube through the water production channel, and then flow out at one end. Impurities in the water, such as ions, organic matter, bacteria, viruses, etc., are retained in the incoming side of the membrane and then flow out at the discharge end of the concentrated water. thus achieving the purpose of separation and purification.